<span>
  <div class="list-item required">
    <div class="item-label">开标省份:</div>
    <div class="flow-content">
      <select ng-model="province" ng-options="pro.name for pro in data">
        <option value="" selected disabled>请选择</option>
      </select>
    </div>
  </div>
  <div class="list-item required">
    <div class="item-label">开标地市:</div>
    <div class="flow-content">
      <select ng-model="city" ng-options="city.name for city in province.child">
        <option value="" selected disabled>请选择</option>
      </select>
    </div>
  </div>
  <div class="list-item required">
    <div class="item-label">开标区县:</div>
    <div class="flow-content">
      <select ng-model="county" ng-options="county.name for county in city.child">
        <option value="" selected disabled>请选择</option>
      </select>
    </div>
  </div>
</span>